Lettuce는 Redis용 고급 Java 클라이언트로 Jedis와 함께 이제 SpringBoot 2.0 버전에서 기본 Redis 클라이언트가 되었습니다.
베테랑 Jedis에 비해 Lettuce는 기능이 풍부할 뿐만 아니라 비동기 작업, 반응형 프로그래밍 등과 같은 많은 새로운 기능을 제공하는 동시에 Jedis의 스레드 불안정 문제를 해결하는 떠오르는 별입니다.
먼저 Maven 프로젝트를 생성하고 lettuce-core
패키지를 소개하면 사용 가능합니다. lettuce-core
包,就可以使用了。
<dependency> <groupId>io.lettuce</groupId> <artifactId>lettuce-core</artifactId> <version>5.3.1.RELEASE</version> </dependency>
使用 lettuce 连接 redis,测试是否能正常联通!
public class LettuceMain { public static void main(String[] args) { RedisURI redisUri = RedisURI.builder() .withHost("127.0.0.1") .withPort(6379) .withPassword("111111") .withTimeout(Duration.of(10, ChronoUnit.SECONDS)) .build(); RedisClient redisClient = RedisClient.create(redisUri); StatefulRedisConnection<String, String> connection = redisClient.connect(); RedisCommands<String, String> commands = connection.sync(); System.out.println(commands.ping()); connection.close(); redisClient.shutdown(); } }
基本上只要是 Jedis 支持的同步命令操作,Lettuce 都支持。
下面,我们以同步操作字符串为例,Lettuce 的 api 操作如下!
public class LettuceSyncMain { public static void main(String[] args) { RedisURI redisUri = RedisURI.builder() .withHost("127.0.0.1").withPort(6379).withPassword("111111") .withTimeout(Duration.of(10, ChronoUnit.SECONDS)) .build(); RedisClient redisClient = RedisClient.create(redisUri); StatefulRedisConnection<String, String> connection = redisClient.connect(); //获取同步操作命令工具 RedisCommands<String, String> commands = connection.sync(); System.out.println("清空数据:"+commands.flushdb()); System.out.println("判断某个键是否存在:"+commands.exists("username")); System.out.println("新增<'username','xmr'>的键值对:"+commands.set("username", "xmr")); System.out.println("新增<'password','password'>的键值对:"+commands.set("password", "123")); System.out.println("获取<'password'>键的值:"+commands.get("password")); System.out.println("系统中所有的键如下:" + commands.keys("*")); System.out.println("删除键password:"+commands.del("password")); System.out.println("判断键password是否存在:"+commands.exists("password")); System.out.println("设置键username的过期时间为5s:"+commands.expire("username", 5L)); System.out.println("查看键username的剩余生存时间:"+commands.ttl("username")); System.out.println("移除键username的生存时间:"+commands.persist("username")); System.out.println("查看键username的剩余生存时间:"+commands.ttl("username")); System.out.println("查看键username所存储的值的类型:"+commands.type("username")); connection.close(); redisClient.shutdown(); } }
除此之外,Lettuce 还支持异步操作,将上面的操作改成异步处理,结果如下!
public class LettuceASyncMain { public static void main(String[] args) throws Exception { RedisURI redisUri = RedisURI.builder() .withHost("127.0.0.1").withPort(6379).withPassword("111111") .withTimeout(Duration.of(10, ChronoUnit.SECONDS)) .build(); RedisClient redisClient = RedisClient.create(redisUri); StatefulRedisConnection<String, String> connection = redisClient.connect(); //获取异步操作命令工具 RedisAsyncCommands<String, String> commands = connection.async(); System.out.println("清空数据:"+commands.flushdb().get()); System.out.println("判断某个键是否存在:"+commands.exists("username").get()); System.out.println("新增<'username','xmr'>的键值对:"+commands.set("username", "xmr").get()); System.out.println("新增<'password','password'>的键值对:"+commands.set("password", "123").get()); System.out.println("获取<'password'>键的值:"+commands.get("password").get()); System.out.println("系统中所有的键如下:" + commands.keys("*").get()); System.out.println("删除键password:"+commands.del("password").get()); System.out.println("判断键password是否存在:"+commands.exists("password").get()); System.out.println("设置键username的过期时间为5s:"+commands.expire("username", 5L).get()); System.out.println("查看键username的剩余生存时间:"+commands.ttl("username").get()); System.out.println("移除键username的生存时间:"+commands.persist("username").get()); System.out.println("查看键username的剩余生存时间:"+commands.ttl("username").get()); System.out.println("查看键username所存储的值的类型:"+commands.type("username").get()); connection.close(); redisClient.shutdown(); } }
Lettuce 除了支持异步编程以外,还支持响应式编程,Lettuce 引入的响应式编程框架是Project Reactor
public class LettuceMain { public static void main(String[] args) throws Exception { RedisURI redisUri = RedisURI.builder() .withHost("127.0.0.1").withPort(6379).withPassword("111111") .withTimeout(Duration.of(10, ChronoUnit.SECONDS)) .build(); RedisClient redisClient = RedisClient.create(redisUri); StatefulRedisConnection<String, String> connection = redisClient.connect(); //获取响应式API操作命令工具 RedisReactiveCommands<String, String> commands = connection.reactive(); Mono<String> setc = commands.set("name", "mayun"); System.out.println(setc.block()); Mono<String> getc = commands.get("name"); getc.subscribe(System.out::println); Flux<String> keys = commands.keys("*"); keys.subscribe(System.out::println); //开启一个事务,先把count设置为1,再将count自增1 commands.multi().doOnSuccess(r -> { commands.set("count", "1").doOnNext(value -> System.out.println("count1:" + value)).subscribe(); commands.incr("count").doOnNext(value -> System.out.println("count2:" + value)).subscribe(); }).flatMap(s -> commands.exec()) .doOnNext(transactionResult -> System.out.println("transactionResult:" + transactionResult.wasDiscarded())).subscribe(); Thread.sleep(1000 * 5); connection.close(); redisClient.shutdown(); } }
public class LettuceReactiveMain1 { public static void main(String[] args) throws Exception { RedisURI redisUri = RedisURI.builder() .withHost("127.0.0.1").withPort(6379).withPassword("111111") .withTimeout(Duration.of(10, ChronoUnit.SECONDS)) .build(); RedisClient redisClient = RedisClient.create(redisUri); //获取发布订阅操作命令工具 StatefulRedisPubSubConnection<String, String> pubsubConn = redisClient.connectPubSub(); pubsubConn.addListener(new RedisPubSubListener<String, String>() { @Override public void unsubscribed(String channel, long count) { System.out.println("[unsubscribed]" + channel); } @Override public void subscribed(String channel, long count) { System.out.println("[subscribed]" + channel); } @Override public void punsubscribed(String pattern, long count) { System.out.println("[punsubscribed]" + pattern); } @Override public void psubscribed(String pattern, long count) { System.out.println("[psubscribed]" + pattern); } @Override public void message(String pattern, String channel, String message) { System.out.println("[message]" + pattern + " -> " + channel + " -> " + message); } @Override public void message(String channel, String message) { System.out.println("[message]" + channel + " -> " + message); } }); RedisPubSubAsyncCommands<String, String> pubsubCmd = pubsubConn.async(); pubsubCmd.psubscribe("CH"); pubsubCmd.psubscribe("CH2"); pubsubCmd.unsubscribe("CH"); Thread.sleep(100 * 5); pubsubConn.close(); redisClient.shutdown(); } }
public class LettuceMain { public static void main(String[] args) throws Exception { ClientResources resources = DefaultClientResources.builder() .ioThreadPoolSize(4) //I/O线程数 .computationThreadPoolSize(4) //任务线程数 .build(); RedisURI redisUri = RedisURI.builder() .withHost("127.0.0.1").withPort(6379).withPassword("111111") .withTimeout(Duration.of(10, ChronoUnit.SECONDS)) .build(); ClientOptions options = ClientOptions.builder() .autoReconnect(true)//是否自动重连 .pingBeforeActivateConnection(true)//连接激活之前是否执行PING命令 .build(); RedisClient client = RedisClient.create(resources, redisUri); client.setOptions(options); StatefulRedisConnection<String, String> connection = client.connect(); RedisCommands<String, String> commands = connection.sync(); commands.set("name", "关羽"); System.out.println(commands.get("name")); connection.close(); client.shutdown(); resources.shutdown(); } }
public class LettuceMain { public static void main(String[] args) throws Exception { ClientResources resources = DefaultClientResources.builder() .ioThreadPoolSize(4) //I/O线程数 .computationThreadPoolSize(4) //任务线程数 .build(); RedisURI redisUri = RedisURI.builder() .withHost("127.0.0.1").withPort(6379).withPassword("111111") .withTimeout(Duration.of(10, ChronoUnit.SECONDS)) .build(); ClusterClientOptions options = ClusterClientOptions.builder() .autoReconnect(true)//是否自动重连 .pingBeforeActivateConnection(true)//连接激活之前是否执行PING命令 .validateClusterNodeMembership(true)//是否校验集群节点的成员关系 .build(); RedisClusterClient client = RedisClusterClient.create(resources, redisUri); client.setOptions(options); StatefulRedisClusterConnection<String, String> connection = client.connect(); RedisAdvancedClusterCommands<String, String> commands = connection.sync(); commands.set("name", "张飞"); System.out.println(commands.get("name")); connection.close(); client.shutdown(); resources.shutdown(); } }
Project Reactor
를 지원합니다. 먼저 스스로 해보세요. 반응형 프로그래밍 사용 사례는 다음과 같습니다. public class LettuceMain { public static void main(String[] args) throws Exception { RedisURI redisUri = RedisURI.builder() .withHost("127.0.0.1") .withPort(6379) .withPassword("111111") .withTimeout(Duration.of(10, ChronoUnit.SECONDS)) .build(); RedisClient client = RedisClient.create(redisUri); //连接池配置 GenericObjectPoolConfig poolConfig = new GenericObjectPoolConfig(); poolConfig.setMaxIdle(2); GenericObjectPool<StatefulRedisConnection<String, String>> pool = ConnectionPoolSupport.createGenericObjectPool(client::connect, poolConfig); StatefulRedisConnection<String, String> connection = pool.borrowObject(); RedisCommands<String, String> commands = connection.sync(); commands.set("name", "张飞"); System.out.println(commands.get("name")); connection.close(); pool.close(); client.shutdown(); } }
public class LettuceMain { public static void main(String[] args) throws Exception { //这里只需要配置一个节点的连接信息,不一定需要是主节点的信息,从节点也可以;可以自动发现主从节点 RedisURI uri = RedisURI.builder().withHost("192.168.31.111").withPort(6379).withPassword("123456").build(); RedisClient client = RedisClient.create(uri); StatefulRedisMasterReplicaConnection<String, String> connection = MasterReplica.connect(client, StringCodec.UTF8, uri); //从节点读取数据 connection.setReadFrom(ReadFrom.REPLICA); RedisCommands<String, String> commands = connection.sync(); commands.set("name", "张飞"); System.out.println(commands.get("name")); connection.close(); client.shutdown(); } }
public class LettuceMain { public static void main(String[] args) throws Exception { //集群节点 List<RedisURI> uris = new ArrayList(); uris.add(RedisURI.builder().withHost("192.168.31.111").withPort(6379).withPassword("111111").build()); uris.add(RedisURI.builder().withHost("192.168.31.112").withPort(6379).withPassword("111111").build()); uris.add(RedisURI.builder().withHost("192.168.31.113").withPort(6379).withPassword("111111").build()); RedisClient client = RedisClient.create(); StatefulRedisMasterReplicaConnection<String, String> connection = MasterReplica.connect(client, StringCodec.UTF8, uris); //从节点读取数据 connection.setReadFrom(ReadFrom.REPLICA); RedisCommands<String, String> commands = connection.sync(); commands.set("name", "张飞"); System.out.println(commands.get("name")); connection.close(); client.shutdown(); } }
public class LettuceMain { public static void main(String[] args) throws Exception { //集群节点 List<RedisURI> uris = new ArrayList(); uris.add(RedisURI.builder().withSentinel("192.168.31.111", 26379).withSentinelMasterId("mymaster").withPassword("123456").build()); uris.add(RedisURI.builder().withSentinel("192.168.31.112", 26379).withSentinelMasterId("mymaster").withPassword("123456").build()); uris.add(RedisURI.builder().withSentinel("192.168.31.113", 26379).withSentinelMasterId("mymaster").withPassword("123456").build()); RedisClient client = RedisClient.create(); StatefulRedisMasterReplicaConnection<String, String> connection = MasterReplica.connect(client, StringCodec.UTF8, uris); //从节点读取数据 connection.setReadFrom(ReadFrom.REPLICA); RedisCommands<String, String> commands = connection.sync(); commands.set("name", "赵云"); System.out.println(commands.get("name")); connection.close(); client.shutdown(); } }
public class LettuceReactiveMain4 { public static void main(String[] args) throws Exception { Set<RedisURI> uris = new HashSet<>(); uris.add(RedisURI.builder().withHost("192.168.31.111").withPort(7000).withPassword("123456").build()); uris.add(RedisURI.builder().withHost("192.168.31.112").withPort(7000).withPassword("123456").build()); uris.add(RedisURI.builder().withHost("192.168.31.113").withPort(7000).withPassword("123456").build()); uris.add(RedisURI.builder().withHost("192.168.31.114").withPort(7000).withPassword("123456").build()); uris.add(RedisURI.builder().withHost("192.168.31.115").withPort(7000).withPassword("123456").build()); uris.add(RedisURI.builder().withHost("192.168.31.116").withPort(7001).withPassword("123456").build()); RedisClusterClient client = RedisClusterClient.create(uris); StatefulRedisClusterConnection<String, String> connection = client.connect(); RedisAdvancedClusterCommands<String, String> commands = connection.sync(); commands.set("name", "关羽"); System.out.println(commands.get("name")); //选择从节点,只读 NodeSelection<String, String> replicas = commands.replicas(); NodeSelectionCommands<String, String> nodeSelectionCommands = replicas.commands(); Executions<List<String>> keys = nodeSelectionCommands.keys("*"); keys.forEach(key -> System.out.println(key)); connection.close(); client.shutdown(); } }
위 내용은 Redis에서 양상추를 사용하는 방법의 상세 내용입니다. 자세한 내용은 PHP 중국어 웹사이트의 기타 관련 기사를 참조하세요!